This is the new Pluto - Explored! Souvenir Sheet of 4
This stamp issuance celebrates NASA's history-making first reconnaissance of Pluto in 2015 by the New Horizons mission.
The “Pluto—Explored!” souvenir sheet contains two stamp designs. One shows an artist’s rendering of the New Horizons spacecraft. The other shows the spacecraft’s striking image of Pluto taken near closest approach. The view—which is color-enhanced to highlight surface texture and composition—is a composite of four images from New Horizons’ Long Range Reconnaissance Imager (LORRI), combined with color data from the imaging instrument Ralph. It clearly reveals the now-famous heart-shaped feature that measures about 1,000 miles across at its widest point.
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